Since we upgraded to Echange 2013 CU7 we have been seeing this in the CAS server event logs
Source: MSExchange Front End HTTP Proxy
Date: 3/9/2015 2:41:41 PM
Event ID: 2002
Task Category: Core
Level: Warning
Keywords: Classic
User: N/A
Computer: Exchangeserver.domain.com
Description:
[Eas] The number of outstanding requests for guard TargetBackend("vpw1202exch01.bellevue.edu") has exceeded the max limit 150. Current request will be rejected.
I saw someone else had reported this on TechNet, going back to July last year and it looked like it may be something triggered when they upgraded to SP1 but no answer was provided. Does anyone know what causes this and how I can resolve it?